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John Smith

#13142

Selective debridging | 1 January, 1999

Give me your opinions and experiences of SelectX, selective debridging system in the Vitronics Soltec wave soldering machines.

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Steve Evers

#13143

Selective bridging? | 4 January, 1999

| Give me your opinions and experiences of SelectX, selective debridging system in the Vitronics Soltec wave soldering machines. | Opinion and (food for thought)?: First let me say that I am not familiar with SelectX. In the past, manufacturing engineers and soldering machine designers I have had the privelidge of meeting with have stated that "hot air knives" and such are nothing more than "a band-aid for a bad process". I have come to know that this is not 100%true, however, there is a barrel of truth to that statement. They've also stated, If a wave soldering process or any other process for that matter is looked at, studied and characterizations are run you can approach six sigma yields. Granted with wave soldering, one must include solderability and pcb layouts, flux and such tedium. Having witnessed many machine evaluations, I can say some wave soldering systems and set-ups are far better at producing first pass defect free soldering than others. (some systems are more prone to troublesom bridging) Mostly, I suspect its a matter of the designers wave dynamics that are inherent to the solder module. Over that its a matter of fine-tuning the speeds, flux and preheat type and parameters. In other words, "one manufacturers wave is not the other guys wave, no matter how good it looks." Furthermore, I've learned solder dynamics are quite tricky, and a bit of a black art.

If the system in question boasts its abilities to erace its own defects, wouldn't it be better to focus on not making those defects first? After all "selective DE-bridging" is only a necessity if you have selective bridging in the first place... , no?

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